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Tag pacing is the buffer period for outgoing Transmission messages which allows tag change events to be buffered to reduce the number of generated MQTT messages. If you set this pacing too slow, with a large volume of tag changes, messages can easily exceed the 128KB limit. 

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To find the largest published message size, navigate to the MQTT Transmission in the Ignition Designer Tag Browser. Drill down to your Transmitter and you should see the ‘Largest Mesg Xmit’ tag as shown below.

Resolution

• Configure the Transmitter to use a compression algorithm to compress the payload before publishing
• Modify your tag structure such that no messages exceed this limit.
  • This typically means dividing tags up across ‘Device level folders’ so the size of each NBIRTH, NDEATH, DBIRTH or DDEATH message is less than 128KB
• Check that your Tag Pacing period is not causing messages greater the 128KB to be generated.
  • Wireshark can be helpful in performing this tuning.

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From the Ignition Logs view, select the Download icon to download a copy of the system-name.idb file to your local file system. You will need to compress (zip, 7z or rar) this file before sending to Support.

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